题目内容
如图所示,物体的质量
,用与竖直方向成
的斜向右上方的推力
把该物体压在竖直墙壁上,并使它沿墙壁在竖直方向上做匀速直线运动。物体与墙壁间的动摩擦因数
,取重力加速度
,求推力
的大小。(
,
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241149423292176.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942219444.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942235280.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942251200.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942251288.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942266471.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942251200.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942297474.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942313475.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241149423292176.gif)
40N
若向上做匀速直线运动,受力如图(1)所示
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411494234473.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241149423602009.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411494234473.gif)
(1分)
(1分)
(1分)
推力
(1分)
若向下做匀速直线运动,受力如图(2)所示
(1分)
(1分)
(1分)
推力
(1
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411494234473.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241149423602009.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411494234473.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942375582.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942407484.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942422427.gif)
推力
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241149424381255.gif)
若向下做匀速直线运动,受力如图(2)所示
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942438571.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942407484.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114942422427.gif)
推力
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241149424851279.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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